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bug#41755: feature/native-comp (master?): temacs crash in GC during mark
From: |
Pip Cet |
Subject: |
bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase |
Date: |
Sun, 7 Jun 2020 20:18:09 +0000 |
On Sun, Jun 7, 2020 at 7:58 PM Nicolas Bértolo <nicolasbertolo@gmail.com> wrote:
> I can confirm that what I found was this issue.
>
> > Does it happen for non-optimized builds? Also, what symbol is at
> > Lisp_Object value 0xb4f0 (i.e. iQwhatever == 405)?
>
> I haven't been able to reproduce it in non-optimized builds.
But you still have last_marked in your build, right? That would be a
good starting point to find out which object was marked and what was
actually on the stack there...
> What I understand so far is that the GC begins marking the stack of the main
> thread and it takes some data in the stack as a pointer to valid Lisp data.
That's my understanding as well. In Andrea's case, it looks like
something was marked as though it were a symbol, but it was actually
pointing back to the stack...
> It
> starts following all the pointers and it eventually SIGSEGVs. I have seen it
> crash trying to read symbols, conses and strings.
Is it always a symbol that's found on the stack by mark_maybe_*, though?
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Andrea Corallo, 2020/06/07
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Pip Cet, 2020/06/07
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Nicolas Bértolo, 2020/06/07
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Pip Cet, 2020/06/08
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Nicolas Bértolo, 2020/06/08
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Pip Cet, 2020/06/08
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Nicolas Bértolo, 2020/06/09
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Andrea Corallo, 2020/06/10
- bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase, Andrea Corallo, 2020/06/27